Principal Systems Engineer - OT Security

Fortinet, Inc.; Bengaluru; On-site; INR 4,000,000 - 7,000,000; Full time

Job summary

Fortinet, Inc. seeks Principal Systems Engineers with OT/CI and critical infrastructure expertise to bolster our Global OT team. You will enable the Sales and Systems Engineering organization in OT/CI environments and validate Reference Architectures for customer deployments.

You will contribute to compliance mapping, technical guidance, and RA development across industrial sectors, including Power, O&G, and Manufacturing, while supporting post-sales technical escalations as needed.

Qualifications

• 12+ years in technical/pre-sales support as sales or systems engineer.
• 4–5 years hands-on OT/ICS/SCADA/PLC/RTU environments.
• Experience with industrial clients in Power/O&G/Manufacturing/Transport/Logistics/Smart Buildings.
• Knowledge of IEC62443, NIST CSF, CIS Top 20, ISO 27XXX, NERC-CIP.
• Familiarity with OT/CI protocols (EthernetIP, Modbus, DNP3, IEC 104, OPC).
• LAN/WAN/Internet services administration; DNS/NFS/SMTP/HTTP/TCP/IP understanding.

Responsibilities

• Pre-sales support: qualify sales leads from a technical standpoint for OT/CI security solutions.
• Assist on sales calls, explain features, specs, and Fortinet product integrations for OT/CI customers.
• Review Reference Architecture and design/test to ensure field success of deployed solutions.
• Document Reference Architectures as Technical Guides for end users in OT/CI contexts.
• Provide technical guidance to OT/CI Systems Engineers and SMEs for future RA’s.
• Modify RA network security design and implementation guidance to meet customer needs.

Skills

OT/ICS experience

Pre-sales

Systems engineering

Networking fundamentals

Technical documentation

Compliance knowledge

Education

Bachelor’s Degree or equivalent

Tools

Fortinet FortiOS

Reference Architecture

Test planning

Job description

Job Info

• Job Identification 23306
• Job Category Systems Engineering
• Posting Date 07/23/2026, 07:10 AM
• Job Schedule Full time

Job Description

Role Overview:

We are looking for Principal Systems Engineers, with Operational Technology & Critical Infrastructure experience, to work within an OT Global team within Fortinet to enable our Sales and Systems Engineering organization to be highly successful within sales calls and systems engineering to Operational Technology and Critical Infrastructure customers and their environments. The Systems Engineer's mission will be to enable the Operational Technology and Critical Infrastructure organization to strongly validate design solutions presented to the Sales and Systems Engineering Organization as a Reference Architecture (RA) to build their business from within these target clients. They will also support the Global compliance, laws, regulations, etc. of these Operational Technology & Critical Infrastructure systems by mapping these criteria’s back to our Fortinet products.

Your Key Responsibilities:

• Pre-sales - Assist in qualifying sales leads, from a technical standpoint, of Operational Technology and Critical Infrastructure Security Solutions. This could also include the compliance, laws, regulations, etc. that map to our Fortinet products.
• Sales calls - Enabling technical resources on sales calls and answer/educate the customer on issues ranging from features, specifications, and functionality to the integration of Fortinet’s products for Operational Technology and Critical Infrastructure Security Solutions in the Purdue model. This could also include the compliance, laws, regulations, etc. that map to our Fortinet products.
• Conversant with Operational Technology, Information Technology, L1 to L7 networking, applications and solutions.
• Review product Reference Architecture and functional specification, design and execute test plan to ensure field success of a real world deployed solution.
• Technically document Reference Architecture’s as a Technical Guide for end users within Operational Technology and Critical Infrastructure clients to follow when deploying a Solution RA.
• Provide technical guidance to Systems Engineers and SMEs within OT & CI to build future RA’s.
• Modify RA network security design and implementation guidance internally and externally to meet the customer’s requirements.
• Test new features and/or new FortiOS releases to ensure alignment with existing RA’s.
• Input into the development of IC­S oriented solutions and services.
• Identify and drive early engagement/alignment on large OT projects.
• Verify FortiGate configurations and implement the best practices per Sector and with documentation.
• Perform interoperability evaluation of devices that interact with Fortinet products.
• Tackle difficult problems and provide solutions for new product developments.
• Post-sales - be the lead technical contact for identified accounts for technical issues and work closely with the technical support team and engineering team to answer, elevate, and resolve customer's technical issues.
• Provide assistance to identify customers with post-sales training.

Minimum 12 years’ experience in technical/pre-sales support as a sales or systems engineer

4 - 5 years’ Hands‑on experience, as well as technical operations, of the Operational Technology/Industrial Control Systems/Supervisory Control and Data Acquisition environments (ICS & SCADA systems, PLCs & RTUs, HMI & Historian, Smart sensors & actuators)

Experience dealing with industrial clients within one or more sub-industries, such as Power, O&G, Manufacturing, transportation & logistics, or Smart Buildings.

Knowledge of the key Industrial Security Policies, Standards, and Guidelines (IEC 62443, NIST CSF, CIS Top 20, ISO 27XXX, NERC-CIP)

Familiarity with the common industrial protocols (EthernetIP, Modbus, DNP3 & IEC 104, OPC etc.)

• Strong understanding of LAN/WAN/Internet services administration
• Strong understanding of DNS and NFS, SMTP, HTTP, TCP/IP
• Knowledge of the following technologies: Routing, Switching, VPN, LAN, WAN, Network Security, Intrusion Detection, and Anti-Virus used in the Purdue model.
• Strong understanding in the following technologies and protocols: RADIUS, PKI, IKE, Certificates, L2TP, IPSEC, FIREWALL, 802.1Q, MD5, SSH, SSL, SHA1, DES, 3DES
• Experience with encryption and authentication technologies
• Strong understanding of the common OT and CI protocols
• Familiar with IEC62443, NIST and other OT framework.
• Bachelor’s Degree or equivalent experience.